However, according to Israel's Channel 2, Mandelbilt has received new information to escalate the inquiry into a full-blown criminal investigation.

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Among the allegations are that Netanyahu accepted large sums of money from convicted French fraudster Arnaud Mimran. In July, Mimran was jailed for eight years and fined €1m (£850,000) for carbon-tax fraud in what French media described as "sting of the century".

Netanyahu is also accused of using state money for personal jaunts, with his wife and children. Last year, he went on a six-day trip to New York dipping into $600,000 (£462,000) of state funds – which included spending $1,600 on a personal hairdresser.

However, a spokesman for the prime minister has labelled all the claims as baseless.

In a statement sent to Haaretz, the spokesman said: "It's all idle chatter. Since Netanyahu's victory in the last election and well before that, forces hostile to the prime minister have made enormous efforts to topple him, hurling false accusations against him and against his family.